@article{106661, author = {Vladim\'\i r Pu\v s}, title = {Chromatic number of products of graphs}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {029}, year = {1988}, pages = {457-463}, zbl = {0668.05030}, mrnumber = {972829}, language = {en}, url = {http://dml.mathdoc.fr/item/106661} }
Puš, Vladimír. Chromatic number of products of graphs. Commentationes Mathematicae Universitatis Carolinae, Tome 029 (1988) pp. 457-463. http://gdmltest.u-ga.fr/item/106661/
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, personal communication.